And stephen wilcox



(No Model.)

N. W. PRATT.

STEAM BOILER. No. 249,671. Patented Nov. 15,1881.

UNITE "STATES PATENT OFFICE.

NATHANIEL IV. PRATT, OF' BROOKLYN, NEW YORK, ASSIGNOR TO GEORGE H. BABOOOK, OF PLAINFIELD, NEW JERSEY, AND STEPHEN WILOOX, OF

BROOKLYN, NEW YORK.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 249,671, dated November 15, 1881.

Application filed December 22, 1880. (No model.)

To all whom it may concern Be it known that I, NATHANIEL W. PRATT, a citizen of the United States, residing at the city of Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Steam-Boilers, of

which the following is a specification.

My invention relates to improvements in that class of steam-boilers known in the trade as Babcock 8: Wilcox boilers.

According to my present invention, in place of em ploying a horizontal steam-drum arranged over and in a line with the sectional tubes, as is the general practice in constructing boilers of this class, I employa horizontal steam-drum extending transversely across the ends of two or more sections. The tubes arein two series, one inclined and the other horizontal. The end castings of the inclined series at the back end are connected at the bottom to a muddrum, and at the top by tubes to the under side of the steam-drum. The end castings at the front are connected to one end of a horizontal series of tubes which form the top of 2 the furnace and flue spaces. The other ends of this horizontal series are connected to the side of the steam-drum. The steam-drum is constructed with asteam-dome. The horizontal series of tubes supports a non-conducting 0 cover formed in sections capable of removal to give ready access to the sectional tubes.

The following is a description of what I consider the best means of carrying out the invention. v

5 The accompanying drawings form a part of this specification.

Figure 1 is asideview of aboiler constructed according to my invention, mainly in section. Fig. 2 is a plan view of the same, also partly in section. I

Similar letters of reference indicate like parts in both the figures.

Ais the horizontal steam-drum, arranged as shown, and extending transversely across the ends of two series of sectional tubes, B. The sectional tubes are arranged in two series, theone series, B, beinginclined,andthe other, B in a horizontal plane. The-back castings,

Z), of the inclined tubes B are at their lower ends connected to a mud-drum, C, while their upper ends are provided with tubes b leading to the under side of the steam-drum A. The front castings,b, of the tubes B are connected to the front end of a series of horizontal tubes, B the rear ends of which are inserted in and secured to the side of the steam-drum Aabove the water line, a deflector, a extending the entire length of the drum A, being employed to deflect the current of mingled steam and water for the purpose of separating them and allowing the steam only to rise into the steamdome A arranged centrally of the length of the drum A, which is furnished with a steampipe, a, and safety-valve a. The pipes B are provided with a sectional removable fire-proof cover, D, which gives access for cleaning the inclined tubes B. The sectional pipes B are arranged over a suitable furnace, as shown, inclosed in suitable brick-work, Z, in a manner common to this class of boilers.

Z is an inclined partition extending across the flue-space Z for the purpose of deflecting the heat and products of combustion. This partition Z is formed of brick-work resting on an inclined frame or support, and extends from 7 5 the side of the drum A to the upper side of the inclined tubes B.

a is a deflector mounted within the drum in a position to receive the current of steam and water issuing from the pipes B and deflectit 8o downward. The water and steam become well separated in traversing through the horizontal tubes B and on being thus deflected the water is thrown downward and the steam rises.

Modifications may be made in many. of the 85 details.

I have shown two partitions extending across the entire nest of tubes, compelling the hot gaseous products of combustion from the fire to traverse across the series of tubes upward, o downward, and again upward.

The water-level in the entire apparatus may vary within wide limits. I propose, under or dinary conditions, to commence with the water low, so that the small quantity of water will 5 allow steam to be raised rapidly. After the apparatus is working water is pumped in pref- In testimony whereof I have hereunto set erably to a level a little below that of the upmy hand, at the city of New York, this 30th per tubes,B day of November, 1880, in the presence of two The partition Z may be vertical, or may be subscribing witnesses. 5 inclined at various other angles than that shown. 1 v NAT. W. PRATT.

I claim as my invention The barrel A, deflector a and dome A as shown, in combination with the pipes 13 B I),

\Vitnesses:

W. GOLBORNE BRooKEs,

m and inclined partition Z, dividing fine-space R. H. PECK.

Z, as herein specified. 

